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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Number of Gaming Entertainment Properties, Open and Operating	27		27
Number of Gaming Entertainment Properties	28		28
Taxes, Other	$ 162.2	$ 114.8	$ 498.6	$ 259.7

X

- Definition

The number of gaming entertainment properties.

+ References

No definition available.

+ Details

Name:	byd_NumberOfGamingEntertainmentProperties
Namespace Prefix:	byd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents number of gaming entertainment properties open and operating.

+ References

No definition available.

+ Details

Name:	byd_NumberOfGamingEntertainmentPropertiesOpenAndOperating
Namespace Prefix:	byd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of tax expense classified as other.

+ References

No definition available.

+ Details

Name:	us-gaap_TaxesOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration